The surface composition of a metal article may be modified by depositing a coating layer material of a different composition from a consumable tool which is urged against the article surface while being rotated about an axis generally normal to the surface. The first adapter includes a sensor, a light source, and a processor. An attachment mechanism includes a housing for a spindle having a first portion rotatable within the housing, a shaft extending outwardly from the housing, and a crossmember at the end of the shaft having peripheral dimensions closely conforming to the internal dimensions of the slot. The organic electrolyte solution inhibits decomposition of an electrolytic solution and elution or precipitation of metal ions, and thus the lithium battery including the organic electrolytic solution has excellent cycle characteristics and lifetime characteristics. Thus, the solar electric power supply device can charge the storage cell successively without interruption during the charging process of the storage cell, thereby enhancing the lifetime of the storage cell. The invention also provides a method and apparatus for increased data access in a packet-switched network.